This is movie is suspenseful, interesting, fast paced and well written. I reccommend if you are sci-fi or technology enthusiast. It is really interesting to see how they envisioned advanced technology in 1971. You will be shocked to see how close they were to what things are like now. My one confusion comes in the movie's rating. It is rated G but there is male and female nudity in it and some cursing. I'm not complaining at all, in fact, both the nude scenes featured some good bodies, but someone really stepped away for a smoke break when this movie was being rated. Anyway, I highly reccommend it. An unexpected surprise and treat!